On Sun, 5 Dec 2004 08:54:06 -0700 SQLit wrote: | snipped | |> Secondly, this unit is too large. Try finding one with a NEMA 6-15P or |> 6-20P plug. |>
|> I already went through all the units on several sites, including | Powerware, |> Liebert, Leviton, APC, and TrippLite. None found so far that meet the | need. |>
| | I seriously think that your going to find anything that fits your exact | requirements. It might be time to consider 2 units one 120v and the other | 240v. Having both in the same unit is going to cost big time. Watch out if | the loads i.e. computers are connected to each other by Ethernet. You could | have an potential problem.
The design of such a UPS does not imply any such increased cost. It would simply have a 240 vac to XX vdc input section, and a XX vdc to 120 vac output section. And for many UPS series, those parts are already designed.
If they made UPSes this small in a completely modular way, where each of the parts (AC to DC, battery(s), controller, DC to AC) were separately choosable ("ala carte", or "chinese menu"), this might be it. But no one does that, that I have found (they do that at the 50 kVA range and up).
Some of my loads can run on 240 volts. But not all. It would be a much neater install if all the loads were done at 120 volts. But I have not ruled out switching the computers to 240 volts, and then getting a small
240->120 transformer for the few small remaining loads (consisting mostly of wall warts) that can only use 120. Maybe 300 VA will be plenty for those. I just want to fully explore getting the right kind of UPS before I fall back to plan B. The dedicated circuit is running on 120 volts right now and only has 8 computers on it. But this will be doubled in the next few months as I need to have several more different distributions of Linux and BSD continuously running. Rewiring to a higher gauge is not an option but changing voltage is, at least up to 240.
If I do fall back to plan B, my next quest will be for a small, neat, box that has a NEMA 6-15P plug, a 240 to 120 transformer, and at least one NEMA 5-15R outlet (but if it has several that can fit a bunch of wall warts, even better). The "international power converters" probably won't be continuous duty enough for this (meant more for powering a 10 minute shave or such).